Wrist-plate



(No Model.) v

. J. BARCLAY.

WRIST PLATE.

Patented Apr. 26, 1.892.

hv ENTOI? v w/msssm.

Arm/mm.

UNITE STATES 1 ATENT FFICE.

JAMES BARCLAY, OF SIOUX CITY, IOWA.

WRIST-PLATE.

SPECIFICATION forming part of Letters Patent No. 473,810, dated April26, 1892. Application filed October 22, 1891. Serial No. 409,465. (Nomodel.)

To all whom it may concern.-

Be it known that 1, JAMES BARCLAY, a citizen of Canada, residing atSioux City, in the county of Woodb'ury and State of Iowa, have inventedcertain new and useful Improvements in lVrist-Plates; and I do declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to wrist-plates for en gines, being especiallyadapted to those of the Corliss type.

The object of the invention is to provide a i new and improvedwrist-plate which is simple and durable in construction and arranged topermit the engineer to easily start the engine without being compelledto lift the hookrod and hold it up while manipulating the throttle-valveand starting-bar.

The invention therefore consists in. the novel construction andarrangement of the parts and the combination thereof, as will behereinafter fully set forth, and specially pointed out in the claims.

The invention consists of two plates mounted to turn independently oneof the other and arranged one for the valve-rods and the other for thehook or eccentric rod.

The invention further consists of a device for locking the two platestogether.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 isa side elevation of the improvement. Fig. 2 isa face view ofthe same. Fig. 3 is a sectional plan view of the same on the line 00 asof Fig. 2. Fig. 4 is aside elevation of the cap portion of the lockingdevice.

Referring now to the illustrations, the improved Wrist-plate is providedwith two plates or disks A and B, of which the disk A is provided with acentral hub O, mounted to turn on a suitable stud, said stud beingsuitably fastened to the side of the cylinder in the usual manner. Onthe hub O is mounted to turn the hub D, formed centrally on theseconddisk or plate B, so that the latter is concentric to the plate and bothcan turn independently one of the other. On the front disk A and on theupper end of the same is formed a projection A, carrying the wrist-pinE, adapted to be engaged by the hook of the eccentric-rod, so that aturning motion is imparted to the said disk A from the eccentric. On theback of the other disk B are secured the rearwardly-extending wrist-pinsF, connected in the usual manner with the Valve-rods G for operating thevalves of the engine.

In order to connect the two disks A and B with each other, a lockingdevice H is provided,having a casing I, screwing in the disk A and inwhich is mounted to slide a pin J, formed at its inner end with aconical offset J, adapted to engage a correspondinglyshaped bushingK,held in the face of the disk B. The pin J is secured on the rod L,extending through and having its bearing in a cap N, screwing in thecasing I. Said cap N is threaded on its upper portion, so as to screwinto the threaded portion of said casing I for the following reason:WVhen the cap N is unscrewed by means of handle 0, the threaded upperportion of said cap unscrews and draws out or releases the conicaloffset J from the seat K, the operator then withdrawing the handleO fromthe slot, and by giving it a quarter-turn the disks A and B are allowedto turn independently of each other.

On the outer end of the rod L is secured a handle 0, and on the rod L,within the casing I and the cap N, is coiled a spring P, pressing withone end against the pin J and with its other end at the outer end of thecap N. The pin P has the tendency to force the conical end J to the seatin the bushing K to lock the two plates A and 13 together.

The operation of my invention is as follows: To unlock or disconnect thetwo disksA and B, the operator unscrews the cap N, which acts as ajack-screw to draw out or release the conical-shaped offset J from thebushing K. The operator then withdraws the handle 0 from the slot N inwhich it falls, and then by giving ita quarter-turn he can convenientlyseat the same in the transverse notch N so that the pin J is held in anoutward position or is withdrawn sufficiently into the cap portion sothat the two plates or disks are unlocked or disconnected, so that theycanturn independently of each other. Thus when the engineer desires tostart the engine he simply disconnects the two disks A and B bywithdrawing the pin J from the bushingK in the disk B. The latter canthen be turned so as to bring the valves in the proper position withoutthe engineer touching the hook-rod connected with the stud E. As soon asthe engine is started and the eccentrics commence to turn, the disk A isrotated and the operator by releasing the handle 0 from the notch N andputting it in position for entrance to the slot N permits the pin J todrop into its seat in the bushing K whenever the pin comesopposite thesaid bushing K on the revolving of the disk. Then by means of handle 0the cap N is screwed into the casing I, causing the conical-shapedoffset J 'to be pressed into seat K. The two disks A and B are thenlocked together and the wrist-plate operates inthe usual manner. Thus itwill be seen that the engineer does not disconnect the eccentric-.rodorhook-rod from the wrist-pin E centric rod, and a locking device, substantially as described, for connecting the two disks with each other,vasset forth.

2. The combination, with two disks or wrist plates, of which one isconnected with the valve-rods and the other with the hook or eccentricrod, of a locking mechanism for connecting the two disks with each otherand comprising a spring-pressed pin, a casing carrying the-said pin andsecured on one of the wrist-plates, and a seat held in the otherwristplate and adapted to be engaged by the said spring-p ressed pin,substantially as described.

3. A wrist-plate comprising two plates or disks mounted to turnindependently oneof the other, one of said disks being connected withthe valve-rods and the other with the hook or eccentric rod, and alocking mechan- I ism consisting of a spring-pressed pin adapted adaptedto engage notches provided in said cap to rotate it in eitherdirectionand to hold the pin in or out of contact with the said bushingor seat, all constructed, arranged, and adapted to operate substantiallyas and for the purpose specified.

4. The combination,.with two disks or wrist plates, of which one isconnected with the valve-rods and the otherwit-h the hookor eccentricrod, of a locking mechanism for connecting'the two disks witheachotherandcomprising a spring-pressed pin, a casing, .and cap carrying the saidpinand securedon one of the wrist-plates, a seat held in the otherwrist-plate and adapted to be engaged by the said spring-pressed pin,and a handle connected with the said spring-pressed pin and adapted toengage notches in the-said cap to hold the pin in or out of contact-withthe said bushing or seat, allconstructed, arranged, and intended tooperate substantiallyas set forth.

5. Ina wrist-plate, the combinationof the disks A and B, one of which isconnected with the valve-rods and the other withthe hook or eccentricrod, the pin J, thecasing-I, the cap ,N, provided with the notches N'and N the conical offset J, the bushing K, held in the face of disk B,the handle 0, and the rod .L, and the notch N formed in theface of capN, all as set forth.

In testimony whereof I affix mysignature in presence of two witnesses.

JAMES (BARCLAY. Witnesses:

W. H. HOYT, ALBERT WORTH.

